{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["concept or principle", "manufacturing standard", "process parameter", "material", "process characterization", "enabling technology"], "input": "The dilemma may be caused by two factors : the TO researcher has a lack of knowledge on the AM processes or the direct embedding of AM constraints with mathematical models in the 2D or 3D TO processes is quite tough ."}
{"concept or principle": ["processes", "mathematical", "2D", "3D"], "manufacturing standard": [], "process parameter": [], "material": ["be"], "process characterization": [], "enabling technology": []}